Precision gauge



Jan. 13, 1953 D. G. SCHIEMAN PRECIS ION GAUGE Filed July 2, 1949INVENTOR DAVID e. SOHIEMAN HIS ATTORNEY Patented Jan. 13, 1953 UNITEDSTATES PATENT OFFICE 4 Claims.

This invention relates to improvements in precision tool gauges, andparticularly to a gauge for checking the dimensions of a punch and dieset, or of duplicate parts and plug gauges.

The precision gauging of the punch of a punch and die set for punchingparts having an irregular periphery, or the gauging of duplicate partswith a master or model part, is long and tedious procedure whenaccomplished by the methods known in the prior art. The manufacturing ofparts for machines such as accounting machines requires great accuracy.Many of such parts have irregular peripheries and include many surfaceswhich must be accurately correlated. In the usual method of gauging suchelements a separate setting must be made for each surface gauged andtherefore, it can readily be seen that such a procedure is a timeconsuming one. Applicants device consists of a fixed follower finger anda correlated movable follower finger, for simultaneously gauging a modelpart and a punch, die or other element, the movable finger beingconnected to a dial gauge for indicating the differences between theoutline of the model part and the punch to very close limits.

The object of the invention is to provide a precision gauge mechanismfor checking the pe- .riphery of a punch or die, of a punch and die set,or any other elements.

Another object of the invention is to provide a precision gaugingmechanism for comparing the outline of a model part with a punch or diefor producing duplicate parts thereof.

A specific object of the invention is to provide a common support for amodel part and a punch or die for producing duplicates of the part,whereon the part and the punch, or die, are mounted adjacent each otherand a follower gauge having one finger for following the outline of thepart and a second finger for following the outline of punch, or the die,to check the difference in dimensions between the part and the punch ordie.

With these and incidental objects in view, the invention includescertain novel features of construction and combinations of parts, apreferred form or embodiment of which is hereinafter described withreference to the drawings which accompany and form a part of thisspecification.

Of said drawings: Fig. 1 is a top plan view of the punch gauge shownmounted on a standard.

Fig. 2 is a side elevation view of the punch gauge and showing the modelpart and the punch being gauged in chain lines.

Fig. 3 is a detail view of a typical model part with which the gauge isintended to be used.

General description In the description which follows, a punch and dieset is used for illustrative purposes. It will be clear that any elementto be made to the same dimensions as the model part can begauged withthe present invention with equal facility.

In making punches for precision work in producing machine parts whichmust be held to very close tolerances, the known methods of checking theaccuracies of punches or dies having irregular shapes, consists ofclamping the punch, or die, to a plate and gauging one surface at atime. A separate setting must be made for each surface to be gauged, andwhen gauging a punch having an irregular outline, such a method istedious and time consuming.

In the means disclosed herein, the operation of gauging a punch or a dieis simplified and requires only one setting. In processing intricateparts for precision machines, model parts are made which are assembledinto a machine and the machine is then run through a thorough test todetermine the accuracy of the parts and their performance. The parts ofsuch amachine are then used as models for the mass production of themachines. The parts are made by the usual punch and die method.Applicant uses these model parts as a guide in making the punch and diesets. In gauging the accuracy of a punch, or a die, the model part andthe punch, or die, are mounted adjacent each other on a fixed standard.A dial gauge, having a feeler, is mounted on a support in position withthe feeler on a follower arm, so that the latter is capable of actuatingthe feeler. The follower arm is provided with a finger movable intoengagement with the punch, or the die. Fixedly carried by support is asecond follower arm mounted to engage the model part. When the point onthe model part coincides with the identical point on the punch, or die,the dial indicator reads zero. Then by moving the support to cause thesecond follower to feel around the periphery of the model part, thefirst follower will operate the dial gauge and any variations in contourbetween the model part and the punch, or the die, can be read on theindicator of the dial gauge.

Thus by a simple operation of moving the followers around the contoursof the model part and punch, or die, completes the entire checkingoperation which operation can be performed in a very few minutes.

Detail description A post, or standard I0, is supported on a suitablebase, which base rests on a surface plate during the gauging operation.Clamped to the standard I0, is an arm II, on the free end of which issecured a follower arm supporting bracket |2. The bracket I2 is providedwith an upstanding post l3, on which is mounted any well known dialgauge M, such as, for example, that shown in U. S. Patent No. 1,144,367,issued to H. A. Lowe on June 29, 1915. As illustrated in Lowe, the dialgauge I4 is provided with a feeler 5 for actuating a hand I6 of thegauge H.

The feeler l5 rests on a cam edge ll, of a first follower l8, pivotallymounted on a stud H), the stud being mounted on a removable section 20,of the bracket l2. The pivoted follower I8 is spring urged by a spring26 to press a feeler finger 2| thereon against the edge of a punch 22(shown in chain lines) mounted on a suitable support 23.

Formed on the removable section 20 is a downwardly extending secondfollower 24, which is moved into engagement with a model part 25 (shownin chain lines in Fig. 2, and in full lines in Fig. 3).

The model part 25 shown in Fig. 3 is an example of a part to be made bythe punch being gauged, and illustrates the irregular shapes of punchesto be gauged.

Operation In operation, the punch 22, illustrated herein, and the modelpart 25, are mounted on the support 23, one above the other. Thefollower 24 is then brought into engagement with the model part 25,which brings the finger 2| into engagement with the punch 22. When theworking surfaces of the fingers 2| and 24 are in alinement, theindicator hand l6 reads After the followers 2| and 24 are in engagementwith their respective elements the post |0 is moved to cause thefollowers to follow the contours of the model part. Any deviationbetween the outline dimensions of the two elements causes the followerI8 to move either clockwise or counter-clockwise around the pivot studIS. The cam face controls the movement of the feeler l to indicate theextent of deviation on the dial, either in plus or minus value. Thefeeler I5 is controlled by the cam face I"! since, as is described inthe above named patent, the feeler is spring actuated in one directionto follow the cam face I! and is positively moved by the cam face IT inthe other direction.

While the form of mechanism herein shown and described is admirablyadapted to fulfill the objects primarily stated, it is to be understoodthat it is not intended to confine the invention to the one form orembodiment herein disclosed, for it is susceptible of embodiment invarious other forms.

What is claimed is:

1. In a device of the class described, the combination of a dialindicator having a spring actuated feeling finger to actuate the dialindicator; a portable standard; a support adjustably mounted on theportable standard to enable the support to be positioned at any selectedposition thereon, said support comprising an arm extending at rightangles to the portable standard; a follower pivoted intermediate itsends on the free end of said arm, said follower having one end thereofcontacting with the feeling finger of the dial indicator; a gaugingsurface on the pivoted follower formed on the end opposite said one end,said gauging surface extending below the arm; a stationary follower onsaid arm and extending below said arm adjacent said pivoted follower,said stationary follower having a gauging surface immediately adjacentthe gauging surfaceof the pivoted follower and adapted to be engagedwith a model part by moving the portable standard to guide the gaugingsurface of the pivoted follower around the contour of an element to begauged, said pivoted follower acting to actuate the indicator toindicate differences in contour of the element as compared with themodel part, and a common support for the model part and the element tobe gauged, said model part and said element being located on the supportin contact with each other with their contours in alined relationshipwith each other and in alinement with the respective gauging surfaces.

2. In a device according to claim 1 in which the pivoted follower isspring actuated in one direction and positively actuated in the otherdirection by the contour of the element being gauged.

3. In a device according to claim 1 in which the support for the modelpart and the element to be gauged, and the support for the follower areindependently mounted to permit relative movements therebetween.

4. In a device according to claim 1 in which the followers are mountedon a support which is movable in relation to the element to be gaugedand the model part.

DAVID G. SCHIEMAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,073,089 Bowers Sept. 16, 19131,144,367 Lowe June 29, 1915 1,259,196 Ames Mar. 12, 1918 1,351,663 KochAug. 31, 1920 1,652,435 Goodrich Dec. 13, 1927 1,840,538 Simmons Jan.12, 1932 2,396,383 Moore Mar. 12, 1946 2,425,381 Lovick Aug. 12, 19472,427,152 Moore Sept. 9, 1947 2,480,891 Von Winkle Sept. 6, 1949 OTHERREFERENCES American Machinist, page 745, Nov. 8, 1928.

